If applicable state or federal laws require the approval of the merger by a federal or state agency, the superintendent may withhold delivery of the approved articles of merger until the superintendent receives notice of the decision of such agency. If the final approval of the agency is not given within six months of the superintendent’s approval, the superintendent shall notify the parties to the plan of merger that the approval of the superintendent has been rescinded for that reason. If such agency gives its approval, the superintendent shall deliver the articles of merger, with the superintendent’s approval indicated on the articles, to the secretary of state, and shall notify the parties to the plan of merger. The receipt of the approved articles of merger by the secretary of state constitutes filing of the articles of merger with that office. On the date upon which the merger is effective the secretary of state shall issue a certificate of merger and send the same to the resulting state bank and a copy of the certificate of merger to the superintendent.